天山西部天山云杉径向生长对环境因子的响应OACHSSCD

The growth of Picea schrenkiana is influenced by a variety of environmental factors.Four plots were set up in the middle altitude range(2100-2400 m)of the West Tianshan Nature Reserve,and soil and litter quadrats were set up in the plots.The ring width,basal area increment(BAI),soil and litter organic matter,total nitrogen,total phosphorus and total potassium content of Picea schrenkiana were measured in the plots,and the response differences and main factors of radial growth and environmental factors of Picea schrenkiana were analyzed.The results showed that soil total phosphorus was significantly positively correlated with litter total phosphorus(P＜0.05).Litter C/N was significantly correlated with soil organic matter and soil total nitrogen,and C/P was significantly correlated with soil organic matter,soil total nitrogen,soil total phosphorus and soil total potassium(P＜0.05).Soil C/P was significantly correlated with soil organic matter,soil total nitrogen and soil total phosphorus(P＜0.05).There was a significant positive correlation between Picea schrenkiana and the temperature from January to May of the year,the precipitation in August and September of the previous year and August and September of the current year,and the Palmer drought index in June of the previous year,May and June of the current year(P＜0.05).There was a significant negative correlation between and the temperature in September,December of the previous year,September of the current year,the precipitation in October-December of the previous year,February-April of the current year,and the Palmer drought index in October-December of the previous year,March-April of the current year(P＜0.05).On the time scale,the response to temperature and precipitation is quite different,and the response to PDSI is relatively stable.BAI of Picea schrenkiana was significantly correlated with temperature,litter organic matter,litter total nitrogen,litter total phosphorus,litter C/N,litter C/P,soil total phosphorus,soil C/N and soil C/P(P＜0.05).BAI was positively correlated with precipitation,PDSI,litter total nitrogen,litter total potassium,soil total nitrogen,soil total potassium and soil N/P,and negatively correlated with soil organic matter.Under the combined effects of various environmental factors,the radial growth of Picea schrenkiana was mainly affected by temperature,litter organic matter,litter total nitrogen,litter total phosphorus,litter C/N,litter C/P,soil total phosphorus,soil C/N and soil C/P,and the response to other environmental factors was weak.